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【判断题】
在硫化氢饱和溶液中, S 2- 离子浓度近似等于 K a2 。
A.
正确
B.
错误
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【简答题】You may wish to have your partner ______ you. A) assisting B) assisted C) assist D) assistance 2. If you want to enjoy this piece of music, we can use ______ an Mp4 ______ a walkman (随身...
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【判断题】“杨丽萍国际舞蹈节”不是国家行为。
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